Valve for gas-pumps



(No Model.)

W. F. GARRISON. VALVE FOR GAS PUMPS.

Patented Nov. 21, 1893.

UNITED STATES PATENT OFFICE.

IVILLIAH F. GARRISON, OF BROOKLYN, NEIV YORK.

VALVE FOR GAS-PUMPS.

SPECIFICATION forming part of Letters l atent No. 509,158, datedNovember 21, 1893.

Application filed June 9, 1892. Serial No. 436,082. (No model.)

To ctZ Z whom it may concern.-

Be it known that I, WILLIAM F. GARRISON, of Brooklyn, in the county ofKings and State of New York, have invented a new and useful Improvementin Valves for Gas-Pumps, of wh ch the following is a specification.

My lnvention relates to an improvement in pumps for moving gaseousbodies and more particularly to the structure of the valve whichregulates the induction and eduction of the gaseous fluid.

The object is to provide an effective means for equalizing the pressureupon the opposite sides of the piston, or permitting the free escapeofthe gaseous body in front of the piston, ust as it reaches the limit ofits stroke at the end of the cylinder, into the opposite end of thecylinder; and to further provide a valve which may be constructed atcomparatively small expense and in which the part which controls theinlet or suction ports shall be permitted to seat itself independentlyof the body portion of the valve.

A practical embodiment of my invention is represented in theaccompanying drawings, in which Figure l is a View of the valve chamber,cylinder, valve and piston in assembled adustment; the view representinga longitudinal section through the valve chamber, valve and cylinder.Fig. 2 is a transverse section through the valve chamber, valve andcylinder. Fig. 3 represents the valve, showing its central portionintegral with the body portion. Fig. 4 represents the valve providedwith a plurality of discharge valves; and Fig. 5 represents the valveprovided with discharge valves at its ends instead of at its back.

The cylinder is denoted by A, the piston by a, and the valve chamber,which in the present instance is also the eduction chamber, is denotedby B and is provided with an outlet opening b. v

The induction chamber 0 is formed in the valve seat and connects withthe supply of the gaseous body to be moved through an inlet 0. The portsD and D upon opposite sides of the induction chamber 0, extend throughthe valve seat from the eduction chamber B and communicate with theopposite ends of the cylinder A.

The outer shell or body of the slide valve is denoted by E and eductionports 0 and e lead from its face to the passage way e which is openedand closed by means of a self-acting valve F.

In Figs. 1, 2 and 8, I have shown the ports 6, and e, communicating withthe passage way, closed by a single valve F, while in Figs. 4 and 5, Ihave shown a plurality of self-acting valves F.

In Fig. 5, I have shown a plurality of selfacting valves located at theopposite ends of the valve instead of at the back of the slide valve, asin the other figures. The valves F, F, &o., may be normally pressedtoward their seat by springs f inserted between their backs and anabutment f on their guides. The valve E is provided on its face with acove e through which communication is established between the inductionchamber 0 and the ports D and D in the valve seat as the slide valvereciprocates.

In Figs. 1, 2 and 5, I have shown the portion E of the valve in whichthe cove e is formed as separate from the outer shell or body portion ofthe valve, while in Figs. 3 and 4, I have shown the correspondingportion E as formed integral with the outer shell or body of the valve.Where such portion E is formed separate from the valve body, it may bespaced therefrom at its ends by means of lugs e and at its sides it mayrest inclose proximity to the side walls of the outer or body portion Eof the slide valve.

The structure in which the portion E is formed separate from the outershell or body portion of the valve has the advantages of simplicity anda saving of time and labor in that it requires simply that the bodyportion E be provided with a hollow face and the separate portion Eprovided with a cove in its face and placed in position within thehollow face of the body portion E leaving a sufficicnt space between theends and top or I E will also, when independent of the body portion E,be permitted to seat itself notwithstanding any slight derangement ofthe body portion E, and hence the joint which surrounds the induction orsuction passage may be kept thoroughly sealed, a result of the highestimportance.

In the position shown in Fig. 1, the slide valve is at the middle of itsstroke and the piston in the cylinder A is approximately at the end ofits stroke. In this position it will be observed that there is freecommunication between the parts of the cylinder A in front of and backof the piston a, through the induction ports D and D and the eductionports 8, e. As the piston a moves on its stroke toward the opposite endof the cylinder, the slide valve E. will move over in the direction ofthe arrow so as to bring the induction chamber Ointo communication withthe induction port D, through the'cove e and the gaseous body Within thecylinder A back of the piston will be forced through the port D andthence through the port e and the passage way 6 lifting the valve F andthence escaping into the chamber B. As the piston to nears the oppositeend of the cylinder, the valve E will have returned to the positionshown in Fig. 1 and the opposite ends of the cylinder will be again infree communication through the ports D, D, e, e as before.

It will be observed that by the above structure and arrangement of partsI utilize the eduction ports 6, e for the double purpose of dischargingthe gaseous body and also for equalizing the pressure upon oppositesides of the piston as the latter reaches the limit of its stroke ineither direction. It will further be observed that by varying the spacebetween the ends of the inner or cone valve section and the outer orbody section the relative lead of the eduction over the induction may bevaried as desired.

What I claim is 1. The combination with a cylinder and a slide valve forcontrolling the inlet and outlet of the fluid to and from the cylinder,of a valve seat having ports in communication with the opposite ends ofthe cylinder, the valve and the valve seat being provided the one withan induction passageway and the other with an eduction passageway, and aself acting valve for opening and closing communication between thepassageway in the slide valve and the space exterior to the slide valve,the passageway in the slide valve serving at the same time inconjunction with the ports in the valve seat to open communicationbetween the opposite ends of the cylinder as the piston nears the limitof its stroke, substantially as set forth.

2. The combination with a cylinder and a slide valve for controlling theinlet and outlet of the fluid to and from the cylinder, the central orcove portion of the face of the slide valve being separate from and freeto move toward and away from its seat independently of the outer shellor body portion, and the ends and top of the said cove portion beingspaced from the inner wall of the body portion, of a valve seat havingports in communication With the opposite ends of the cylinder, thedistance between the farthest separated walls of the said ports at theface of the valve being less than the length of the said cove portion ofthe valve, substantially as set forth.

WILLIAM F. GARRISON.

Witnesses:

FREDK. HAYNES, GEORGE BARRY.

